Mathias Kohl worked as a counselor on the station. His patients included people like Lorenzo Calvino, Sarah Elazar and Danielle Sho. He also tried to help Josh Dalton managing his conflict with Lane Carpenter, but to no avail. In one of his emails, Kohl shows concern towards Calvino's mental instability and agitated behaviour during their sessions and decides to bring this to Alex Yu. He's also responsible for creating the behaviour test.